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Yes. I boiled all of it in a large lobster pot before placing any of it in my tank then I pieced it together to form a rock "ledge" for the Calvus. I can't wait until I start to get green algae on the rock surface. The other rock in the tank is 2 different lava rock types: black and gray.Thank you for your kind words btw.

Hey Jeff. Just found this thread. what a gorgeous tank. IF - and that's a big IF - I ever start another tank it's going to be a shelly. If it would look even half as nice as yours I'd consider it a success.